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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcbc7ec496239e2c5b8343d6d04b39e4fca77bad74766fa926893e7c6ca68cd5' 
  AND token = 'qMnTl+51utmXXE2XMzWZ7YaMnFeQPqRR4lUFe/feSC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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