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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1397d60cbe05b789b8b88f7e4a538384a145395e46123f141dcbb4440292f606' 
  AND token = 'w7SOlzgXu4Tued0KEpDLNmyQAghdN1LDaHkWNmlKc6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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