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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bf8bf6daf7c4c181c8d507739ebac1db39f849bb1c12a7ff7ac4d93e24a0342' 
  AND token = 'qtQSH1nrnqvfXhHiZFTAO0OGZBH9g7ScI4L/RMSlSpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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