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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '620cf7effc5a1f860b7f46cae1e15a52073fe69d5e67d63c6bcfa184f453a9c4' 
  AND token = 'RaNexJ66a4kChSznYdfe5GG3Z7gtGMaav2PpAhfPcIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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