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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba2ce6188f9b166a66ae2b23ab3fd95d9773f56742d4d04f7b25e42dee7bbd95' 
  AND token = 'FnsdhS4aGeYN0p3OhXqS0I78j12jw0MK0KY3ebkbv8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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