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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2776bab6c5901c045cf302a802038c6142414ef172fc93b6b373a24362d8820' 
  AND token = 'uNYbDaFHR+Rd5pU35B23uNJQnTty2v1tb7im7/Ik78M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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