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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9831078085a8d988b6152ddc6bd94144a4e6de24a3a70270be9f57a7b1f1cec3' 
  AND token = '+rl08zd0SK9GT9xrSMMTKlbR7qrpQTDBEbYMxB32nE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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