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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e1db0bb5be587be09c07e16afb59fd1bc3fbec88286633b332e06de39ed793f' 
  AND token = 'D4aj1qOU3ErnpuQJeCo+2Eyzirg9PP064hZC5/KlX+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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