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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52f59834393d452a751f50aa9660fb7d8e1a8cd55d8dc87ee575aca0d0294a3e' 
  AND token = 'aYS/ggxFnyoxwwrznt6yK1eC3venzxdV3smXrI2FDLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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