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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5cd669f5c9fe553ef5b80f74decdfedef577fe1cbba6bb7f119e33fdd1f99b1' 
  AND token = 'f1Atp7BIAkKq4bJKH2FCWKvzLHjI3ocPfDt7aKRhOOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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