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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4090ce2edba62248f493c20e71447a29835ec022c1d8da04e7d63151ca75318a' 
  AND token = 'AGQIix2IwMNRU+XvXvaB0yAYT+HwSZ7wcx+xFLKUb4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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