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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '023a59075c9dba596622ccd8a3aec4b6287cac1c0e6b5b48e5bc2541b2529bc3' 
  AND token = 'LSPYoM8aMVLueqdeqwEBLDCkXAI+m5raeT0JFdZ110E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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