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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec1b08c8920e9faacabab0cd120beadc0469a2a0d95290f922ad2c74bd3fe863' 
  AND token = '3hf8/4LwdtdV23c0RNKlMJqUHxs04O7urXfGn9Nl9nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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