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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd319910a0ac8495ea5fb50fd903eb3dbcd3ef079b4f2db5608bb149600d5ef0b' 
  AND token = '9shV2lEIdU5UFxF2ChArB5dHynG1BXLU6jQtvti0EBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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