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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2414916289d10071b07d5b3ff2faa1b0ff42b724ecdf8601d291e1be54ada44c' 
  AND token = 'kXrR59lMjlIiXNL+URw58IJKAO6oQr2D98OlM3ZdHp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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