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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd65b3a5eed83893100e3826c1d00218179cff643d316281daf2892dd6605fec0' 
  AND token = 'eg5dchnlzdMwAkaKjQBRp9vgy5x63hsHrfk5zNKTNYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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