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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20a3479965a475bda0fd7d71aa7e518f064cd80c44d4bd0e9b41c549cbe1239b' 
  AND token = 'I/9iAZ61WbUaD+3Ih3z9vxkOjEGtYPTNwhrr4EEw7X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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