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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5a72866ec97762dd860d0a64fd41223ad96d9648009e0ac9512994ff06edf13' 
  AND token = 'TqOtm/KNpN3VBu+2IBVrZLityBT4T+oanx0YgvOn2F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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