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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ea36cefd498a92f7757b8b37d0aa0c01bd8bf213a6128da07dbc83f6fc107af' 
  AND token = 'Z3tGYqo8QodLBjvLGx2Z4cbCpC3ffWZDIqiiYDUnrLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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