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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca473912c3dc3ed733d705f7a888b5c2c9fc75d583b5bdf480a6b4cb76fc5e48' 
  AND token = 'iwWF1f2VxQiTdhQSs1/VcVkIiPDQ49/dPwcTRglbS1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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