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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff4d32c075ee10fcfa4f874d3685ec7edc350d0a2712c7e1b867c5257f94e202' 
  AND token = 'zSIG8JjQdrUCYFrEROGCMekfsuiRG5bVVqMWEDf6Fzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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