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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ace556de78b89e5161ddc7d13e50cbc8a21a63eedae784a5f658cbd83431e36' 
  AND token = 'HNSSQ0toqskYT1f45FqYgbs710G+dy2haYnOLvO3Kt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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