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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ba408ee80260f9b2de0c1f55c6cd3244a93f717c463aeb1b66838beed9de7e4' 
  AND token = 'G+zT84DIpIokzcT80xpXGPt+FrxPMwkFa9K/aToFRyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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