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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d782ef08403529033024f0048f3ea75e1725c5cd2176c8eadfcf23ae46dc661' 
  AND token = '8z+5ntwtU4Ev9QQLRFrmzwInZB8oJyy2+Y8Lm8cqx78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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