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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee4fcbf16fa5cbd74b4b0a0125d24ddba900adff5fb4a6949d2b1046da396061' 
  AND token = '1npIyc5XBmq4/rb2GKGwalnITkbiJ2LvAWzNTIBwTIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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