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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb14d8a83304e5ad2d99ce5f1b0bc4b9d86c64bf21de591d2055e646df502096' 
  AND token = 'la++wvS8R8XZaz5sgIqaUvgg/zxy00XzUXFcT/GbMwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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