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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bc6b940f183a2ecddd33babeb2f02656969ffa437fc0084c60c2c2d880caca7' 
  AND token = '6iyvryO7KWOUc9tP+y9qKXqf0hJi7HnPiUxmMMFXBIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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