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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '760e0269dfd70c6736dc4261cb454c1b3e181407335da61e8d6eecc5099a3873' 
  AND token = 'BBH4kv1sY1WOHykDfPTbzTfC2Bxlt6voXCHWb92Thvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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