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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd74c55dfc4a97fbb019e86c221bd3065e88a6740d9ba1b76ef6e2100771b854c' 
  AND token = 'NbnSGxPpWbIZylPiCRs1EF5lQ7qPT2BalyuysIwF+4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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