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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3fa3886b6e0b1f90d01ea26c45d0bb583d7d5316ef833552942fb547fc2d00a' 
  AND token = 'i5VsaFDyW3ShaXnh5lnqM5krWVzxqWUBZAmQke7x8q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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