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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '756e23c08acf7e4947884d84360760bfb976f289fd15862d2848ad4945ae2d40' 
  AND token = 'cMRRTmmaFsJzHp6t8DO785zIXuLaCuZ/b3SvurUYKac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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