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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b143f5ed15df3f101dd2f116fc2a3a58c7d44eb4752ffd37ffd02b3d044d342' 
  AND token = 'BREUNHAVhllLRe+x8nVcDuLnTXGJQTIcrytfiJCWAz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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