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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e4d912996a64a8dd87a8a98341b3b10386c507a9d29b3b1c3493a84a735fa00' 
  AND token = 'Qf912mzj0vmZeFUY6C2UHm3Z86Bv5OkIvGBuUusM89s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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