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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b69ab237c73df52f005b68719b71249dcab7dc50317775a27f84943a6b4ab430' 
  AND token = '1fVy9kqdSAuyc3nTmSuZj/kd75Kn/yqiO2prrfXjdGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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