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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c8c1585521a222bfbd7edf331aefae870557a15094206f0ad5267e044d5539c' 
  AND token = 'xOscECYR54PpmX0oDWmNtOv97/c4T6Twvo8kRYzXZeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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