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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '034768339af6e820c432d7540e0f841c22acee55fce9363e02673b0f1b11e650' 
  AND token = 'Gm9edaaBcupHpocrs2QYtKx1LIXv5roubanz5ZOPzhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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