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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf4fc47f8047d405e5b1d4329deee756968b67d9bfe18402f2d3114e524913e6' 
  AND token = 'jPo9oRphxQelob1jb8QiHQhdaO50lWwHfQnBmXrqWKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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