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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bad69b15f7bfb17e630bc00d28ad1af1f993172be567951e842b5b08a7fe7e5' 
  AND token = 'NdLgd1rd7TzmPWCJ1oxS4h6eeqmtXA/wXVvcf76oh9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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