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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8fce1b7ed1189bee8ccf5ff40fc0f9a17399c97df326cd4e114a3e7308bd1ff' 
  AND token = '37+m1yDkshJ/nJTvzc9clzJOCTsu6ewS8HGsczkMcDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}