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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e554d6a2c09af0b6a2ce1eadd8557af10e8f963c853aec93bf8b073c458af8b' 
  AND token = 'sgsKFmr7ak+8ocKUEr5wq4K4XVdLt+ZYsFOclCGFoks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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