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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a226906819ea663d875f61ab294b682f2a641ba93e05ff9304800df89eab56b4' 
  AND token = 'Wq5jtbAIkrtVb0csRl2j42bsjlhII7gVkC9+j2BSkHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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