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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '011ad96f5bc458f87aba6f6932f028bce913d795208a09f85e3f4521b1fa0359' 
  AND token = 'S2EP+kNFXC1XiINvriSPNXCQkQJJpxPvjyOgtHP6048=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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