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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab5d0ced56ed354ffc03b0ea6f6e727e5cac1ca5f4df7e1d3bd3a8e0a8163d42' 
  AND token = 'auzeWLbmvFThdJ3qZWOqEmlatht8fDJvPDwCMkz4ctE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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