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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2637732e0ffacc48598d24d383950a4634ffdd93d2ac5484a7c75d37e0a65746' 
  AND token = 'fpWjVVdDrkuHP5iqPKlbV38goetN2VT2KF1u0Yxc2No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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