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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53de41d253410fa0f5a41d3b534571086c2e281b3da2b6446e5bff689d449bcb' 
  AND token = 'zbR0stKiQr9Q8Qp7+q5U93b6ybu2VxFKiFIpxYxae70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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