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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e51a608f38080a12932a4cf48854dbfab2ce8c9bd708e1706da7461c294f4c7' 
  AND token = 'A/NufocWVCtBIOG3mCWtSPuAEwo40/MO17epR5aHGco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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