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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0d0aadb802c5f25bdaf68ccc54a462b90c3f82a76e0eaf0935c78ce95447155' 
  AND token = 'P2VBqgAGetKqDtFCrKWPnxF96tJrR4oXpInV8vOA19Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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