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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a6e02f85341c9947119fa5781c4549e066d231362e379e52ad2bb16ea3c6588' 
  AND token = 'sgDBocdxoAIAc9UNa9QRsmRdRrSCDnL25fjIJ9e8OEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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