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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cabdcd416f5b597e63c33d5b13bfc6c042789dae51570c5ca9e832404df6a3ab' 
  AND token = '5QrJhYq4orIoA/LhG3TfJffWNrLlBlXJq6euSdnHTxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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