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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78ae8f1c6b27c016c4932608671097093192cc582d88618b2e45714f0e43a847' 
  AND token = 'WO7Tgp7ci2eabF3Ys6ZIJRS5+K5OguHFD4rTpX8z5GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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