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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '298ea9dfe0b180c29d80f6612418397e3ea1a21311697e83ee679384f50bf26f' 
  AND token = 'VID9MixIcfXEAfsxS2962lTsYC9fGUX6RP2+IFWBTyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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