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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39b5e615b3149536941129fc48487e3dd3dcbb292589cd3bc59f20073bdb9b2a' 
  AND token = 'CIXEOpMg80u/QsF8smSd+9CZckRzyopUg4e2GSmWiyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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