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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c00d2775f0423b5535a64b6d99e3c724358ae96d1667514965dbb4965e321e6b' 
  AND token = 'h8tv5uYEk2C5DiWFs9GwwurdtgWV3oSbWYaWgpg8fuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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