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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68e47a843f3c360806d9a1344373255af343b0d85961eeb32f0ea15d93687922' 
  AND token = '5eFiOtP63gZHh2DQrI5Iu1EgUQFY+Jce/e+QuMCteU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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