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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e4bfabf6c38146dba2c2cf7099f7acb1edb5813f6b37681beecc4cc1b052acc' 
  AND token = 'rbPi684uqUNWwTupUjSYeTM5c/lNBjfWc3QznnUKqBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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