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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '802b3e40d78e60ef7a1ae74ec4dd0374cd78efc22a00fbce3ed29a2700425567' 
  AND token = 'MhDU5n+t4ZVE8k6Z+NjPY8ih+ovycbazF5+S4yKuclg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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